TY - JOUR AU - Avery, Richard I. AU - Davis, John M. AU - Henderson, Johnny TI - Three symmetric positive solutions for Lidstone problems by a generalization of the Leggett-Williams theorem JO - Electronic journal of differential equations PY - 2000 VL - 2000 UR - http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a202/ LA - en ID - EJDE_2000__2000__a202 ER -